Hand-operated die-head.



r. w. H. GATES,

HAND OPERATED DIE HEAD.

APPLICATION FILED Auc.19,19|e.

1,24%,89'7. Patented 0%. 9,1917.

2 SHEETSSHEET l- [IIIIIIIII ii; ATTORNEY W. H. GATES.

HAND OPERATED DIE HEAD.

APPLICATION FILED AUG. 19. 1916.

1,242,89 Patented 0012. 9,1917.

2 SHEETSSHEET 2.

INVEN OR llhllTF @TA WILLIAM H. GATES, OF NEW HAVEN, CONNECTICUT.

HAND-OPERATED DIE-HEAD.

Specification of Letters Patent.

Patented (Dot. 9, 1917.

Application filed August 19, 1916. Serial No. 115,757.

To all whom it may concern:

Be it known that I, WILLIAM H. GATES, citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Hand- Operated Die-Heads; and I do hereby declare the following to be a full, clear,'and exact description of the invention, such as will enable others skilled in the art to which it appertains, to make and use the same.

My invention relates to thread cutting tools of the character known in the trade as die heads, it being an improvement on the patent granted to me August 3, 1915, No. 1,148,510. This former construction was particularly adapted for use on automatic machines, wherein all of the operations were automatic, viz.; the advancement of the turret-containing the die headt0 the work, closing the dies, threading, opening the dies, and retreating the turret.

In a great many instances it is not practical to employ automatic machines, and therefore hand-operating machines are necessarily and extensively used. In machines of this character, the turret is under the entire control of the operator, and when the dies are engaged with the work, the forward movement of the turret must be synchronous with the cutting of the threads, otherwise an imperfect threading will result. In other words, the forward movement of the turret must not lag behind the forward movement of the thread cutting dies, and if the operator neglects to mamtain this condition, the dies must necessarily have to pull the heavy turret along which will invariably result in stretching the threads, 8. result not possible in automatic threading machines, as the turret is automatically advanced synchronously with the thread cutting. Among the several improved features of my present invention, I have provided means whereby any neglect on the part of the operator to keep the turret head up to the work of the dies, is automatically rectified.

Referring to the drawings in which- Figure 1 represents a View of the assembled die head Fig. 2 a slightly enlarged central sectional view of several parts of the tool on line 22 of Fig. 1, showing the tool properly adjust ed for cutting threads;

Fig. 3 is an enlarged broken view partly in section showing the position of the several parts at the completion of the threading operation and the tripping mechanism in position to release the dies from the work; Fig. 4 is an enlarged front end view of the die head with the front plate removed, also a broken view of the operating handle for closing the dies;

Fig. 5 is an enlarged detail view and side elevation of the cam ring embracing the cam stud ring, and cam studs for actuating The dies mounted in the cam stud ring;

Fig. 6 is an enlarged detail front elevation of an internally threaded collar movably connected with the movable parts of the tool, broken sectional view of the outer ring,

and central sectional view of-the operating handle secured thereto;

Fig. 7 is an enlarged detail View of the cam stud ring showing the cam studs removed;

Fig. 8 is an enlarged View and a side elevation of the internally threaded collar mounted on a broken section of the die head, and broken view of the die head holder;

Fig. 9 is an enlarged detail plan view of the underside of the rotatable cam disk adapted to be mounted in the outer shell of the die head; 7

Fig. 10 is an enlarged detail sectional View of the cam disk and indicator dial, also a view of the locking bolt engaging the cam recess of the disk; and 4 Fig. 11 is a detail view of one of the dies. Several of the operative parts of the present die head are shown and described in my former patent heretofore referred to, but withv such necessary additions and changes that will adapt them to hand operating die heads.

The holder comprises the flange 1, rear- Wardly projecting extension or shank 2 adapted to be secured to a longitudinally movable turret head-not shown-and the forwardly projecting extension or shank 3, and 4- isa bore extending entirely through the holder. The head 5, Fig. 4, is provided with the radial slots- 6 to receive the threading dies 7. 8 is a hollow extension or shank projecting rearwardly from the head and integral therewith. This extension of the head is slidably mounted on the extension 3 of the holder.

9 is a ring mounted on the shank 8 and it has a sliding movement thereon independently of the sliding movement of the head. This ring, Fig. 7, is provided with the holes 10 adapted to receive the cam studs 11, Figs. 4 and '5, and in which holes said studs are firmly secured by any-suitable and convenient means. These studs, Fig. 4, have a free sliding movement in the holes 12 of the head 5 and are provided at their outer ends with the cam projections 13, Fig. 5, adapted to register with the cam slots lel-see also Fig. 11of the dies 7.

Mounted on the cam stud ring and rotatably embracing the same is the cam ring 15 provided with four cam slots, two of which, 16, are shown in Fig. 5. The four pins 17see also Fig. 7projecting from the cam stud ring 9, register with said cam slots, and through the medium of the cam ring and said pins, the cam stud ring 9 is actuated to and fro to open or close the dies in the manner presently to be more fully described.

18 is an outer shell embracing the principal part of the head, flange 1 of the holder, and intermediate mechanism. This shell is secured to the cam ring 15 by means of the screw 19, Fig. 1, or in any other suitable manner whereby the cam ring is rotated by said shell through the medium of the handle 20 whose inner threaded end 21, Fig. 6, is secured in the threaded hole 22, Fig. 1, of the shell. 4

23 is an interiorly threaded collar secured to the inner threaded end 8 of the shank 8 of the head 5. 24 are studs, Figs. 6 and 8, secured in the holes 25 of thecollar by pins 26. These studs project freely through the holes 27 of. the flange 1 of the holder to prevent rotation of the head 5, and said collar lies normally against the inner face of the reduced shouldered portion 1 of said flange. This shoulder 1*, Fig. 8, forms the circumferential groove 28 between the collar 23 and the flange 1 of the holder adapted to embrace the narrow interior rib 29, Figs. 2 and 3, of the outer shell 5, for the urpose presently to be more fully described:

The collar 23, Fig. 6, has the notch 30 formed in its periphery to prevent the cam ring being rotated far enough to accidentally release the dies from the head as follows: 31 is a pin extending through the handle whose lower end normally lies in the notch 30 during the thread cutting operation, and is held therein by means of the spring 32. Pressure on the handle 20 in the direction of arrow a will cause the outer shell 18 and cam ring 15 to rotate far enough to advance the cam stud ring 9 a distance sufiicient to close the dies. To release the dies from the connected therewith.

neaaser head, all that is necessary is simply to withdraw the handle pin 31 until it is clear of the notch 30, then rotate the shell far enough to bring the inner end of said'pin against th periphery of the collar 23, as shown in the dotted position of the handle. This will have retreated the cam stud ring 9 far enough within the cam ring 15 to permit the cam projections 13 of the cam studs to be entirely withdrawn from the cam slots of the dies and allow said dies to drop from the head.

33, Figs. 1, 2, 3, 9 and 10, is a cam disk rotatably located in the shell 18 and having the cam recess 34 formed in its under surface adapted to be engaged by the locking bolt 35 when the dies are closed. 36 is a spring adapted to force the upper end of the bolt into the cam recess. 35 is a screw to limit the upward movement of the bolt. The indicator dial is secured to the cam disk and is rotated with it. The zero mark on the dial will indicate the standard out, and as the graduations run in both directions from zero, the construction provides for cutting both above and below the standard size. The position of the dial will locate the position of the edge of the cam recess 34 with respect to the locking bolt 35 for the various cuts. This being a well known construction, a more detailed description will be unnecessary.

38, Figs. 1, 2 and 3, is a trip lever pivotally supported on the pin 39 located in the shell 18. Its forward end overlies the pin 40, which pin is freely mounted in the cam disk 33 and rests normally on the top of the locking bolt 35. The opposite threaded end 38 of the lever carries the nut ll of the trip member 38 adjustably mounted on such threaded end, and when brought into engagement with the outer face of the flange 1 of the holder will depress the forward end of the trip lever and actuate the pin 40 to release the locking bolt from the cam recess 3 1 and allow the dies to open, presently to be more fully described.

42 are springs, Figs. 2, 4 and 7, located inthe holes 43 of the head 5, and 44 of the cam stud ring 9 whereby the cam stud ring is forced back after the threading is completed. 45, Figs. 2, 3, 6 and 8, are screws anchored in the collar 23, and 46 aresprings located in the holes 46* of the flange 1 adapted to force back the head 5 and all parts directly The operation of the device is as follows: The operator, after closing the dies by means of the handle 20 as before mentioned, advances the turret, mounted on its slide-not shownforward until the dies are engaged with the work, and it is absolutely necessary that the forward movement of the turret keeps ace with forward travel of the dies to avoid bringing any undue strain on the thread. Failure to keep the turret moving in unison with the dies, will force the dies to drag the turret along which will result in a stretched and distorted thread. With the ordinary hand-operated die head, it iswell nigh impossible to avoid this tendency to dis tort the thread To counteract this tendency I have so constructed the die head that when the operator allows the turret to lag final halt, the head will travel forward a trifle to bring the trip member 41 of the trip lever against the rear end of the flange 1 of the holder, Fig. 3, and, as before mentioned, release the locking bolt 35, when the springs 42 will-return the cam stud ring 9 and the springs 46 will return the head 5, outer shell 18, and collar 23. When the cam stud ring 9 is retreated, it will, of course, cause the dies to open and also impart a. reverse rotation to the outer shell 18.

4:7, Fig. 1, is a plate adapted to secure the dial 37 in any of its adjusted positions, and 48 is a screw for holding the plate against the shell 18.

49 is the front plate held against the head 5 by the screws 50, and the threaded holes 51, Fig. 4:, in the head are for the reception of said screws.

Having thus described my invent-ion, what I claim is:

, 1. A hand operating threading tool comprising a head carrying threading dies having cam slots in their faces, a cam stud member slidably mounted on a reduced portion of the head, cam studs mounted therein having cam projections to register with the cam slots of the dies, pins projecting from the periphery of the cam stud member, a shell freely embracing said member having cam slots registering with said pins, an outer shell embracing the head and cam shell and secured to said cam shell, and having a rotating movement on the head, and p a handle secured to the outer shell for rotating the same to close the threading dies.

ing cam grooves to register with said pins, springs for retreating the cam stud memher after the threading operation, an outer shell rotatably mounted on the head and secured to the cam shell, a cam disk rot-atably mounted in the outer shell, a spring actuated locking bolt engaging therewith a depressible pin overlying the bolt, and a trip lever pivotally mounted in the out-er shell adapted to depress the locking bolt at the completion of the threading operation.

3. In a hand operating threading tool, a holder, a head carrying radially operating dies and slidably mounted on the holder, a cam stud member slidably mounted on the head and operatively connected with the dies, a cam'ring embracing the cam stud member and operatively connected therewith, an outer shell secured to the cam ring, and a handle secured to the shell forrotatmg the same to open and close the dies.

4:. A hand operating threading tool comprising a holder having a flange and forward and rearward extensions projecting therefrom, a head having a reduced rear extension slidably mounted on the forward extension of the holder, a collar secured to the end of the head-extension and normally held against the flange of the holder under spring tension, a cam stud member operat1vely mounted on the head extension, anoverlylng cam ring operatively connected with the cam stud member, radially operatmg dies'mounted in the head and operatively connected with the cam stud member, a spring actuated locking bolt mounted in the head, an outer shell, means for connecting said bolt therewith, a trip lever pivotally supported to the shell and operatively connected with the locking bolt, and a trip member adjustably mounted on the trip lever adapted to engage the holder and actuate the trip lever to disengage the locking bolt from the shell and cause the dies to open and permit the head to retreat.

5. In a hand operating threading tool comprising a holder having a flange and forward and rearward extensions, a die carrying head having a rear extension slidably mounted on the forward extension of the holder, a collar secured to the head extension and connected to the flange of the holder under spring tension, an intermediate cam stud member operatively connected with the dies and operatively mounted on the head extension, a cam ring embracing the cam stud member and operatively connected therewith, an outer shell connected to the cam ring, a locking bolt operatively connected to the outer shell, a trip lever pivotally mounted in said shell, a trip member adjustably mounted on the trip lever, the die head and its operating mechanism adapted to move independently of the holder when the movement of the holder amass? lags behind the forward travel of the dies spring actuated pin carried by the handle 10 during the threading operation. and normally resting in the notch of the 6. In a hand operating threading tool collar to limit the rotation of the shell.

comprising a holder, a die carrying head In testimony whereof I afl ix my signaand die operating mechanism connected ture in presence of two witnesses. therewith, a collar secured to the head hav- WILLIAM H. GATES. ing a notch in. its periphery, an outer shell Witnesses:

rotatively embracing the die head mecha- JOHN C. EVANS,

nism, a handle secured to the shell, and a GEORGEF. SWEET. 

